1.What are taps and when are they used?
Taps are provided on some transformers on the high voltage winding to correct for high or low voltage conditions and still deliver full rated output voltages at the secondary terminal. Standard tap arangements are at two and one-half and five percent of the rated primary voltage for both high and low voltage conditions.
2.What is the difference between ?Insulating?, ?Isolating? and ?Shielded Winding? transformers?
Insulating and isolating are identical. These terms are used to describe the isolation of the primary and secondary windings or isolation between the two. A shielded transformer is designed with a metallic shield between the primary and secondary windings to attenuate transient noise.
3.Can transformers be operated at voltages other than nameplate voltages?
In some cases, transformers can be operated at voltages below the nameplate rated voltage. In NO case should a transformer be operated at a voltage in excess of its nameplate rating unless taps are provided for this purpose.
4.Can 60 Hz transformers be operated at 50 Hz?
Transformers 1 kVA and larger rated at 60 Hz should not be used on 50 Hz service due to the higher losses and resultant heat rise. However, any 50 Hz transformer will operate on a 60 Hz service.
5.Can transformers be used in parallel?
Single phase transformers can be used in parallel only when their impedances and voltages are equal. If unequal volatages are used, a circulating current exists in the closed network between the two transformers which will cause heating and result in a shorter life of the transformer.
6.Can transformers develop three phase power from a single phase source?
No. Phase converters or phase shifting devices such as reactors and capacitors are required to convert single phase power to three phase.
7.What is meant by regulation in a transformer?
Voltage regulation in transformers is the difference between the no load voltage and the full load voltage. This is usually expressed in terms of percentage.
8.What is temperature rise in a transformer?
- Temperature rise in a transformer is the temperature of the windings and insulation above the existing ambient or surrounding temperature.
9.What is ?Class? in insulation?
Insulation class was the orioginal method used to distinguish insulating materials operating at different temperature levels.Letters were used for different designations.
10.Why should dry type transformers never be over-loaded?
Overloading of a transformer results in excessive temperature. This excessive temperature causes overheating which will result in rapid deterioration of the insulation and cause complete failure of the transformer coils.
11.What is meant by ?impedance? in transformers?
Impedance is the current limiting characteristic of a transformer and is expressed in percentage.
12.Why is impedance important?
It is used for determining the interrupting capacity of a circuit breaker or fuse employed to protect the primary of a transformer.
For Example:
1. Determine a minimum circuit breaker trip rating and interrupting capacity for a 10 kVA single phase transformer with 4% impedance to be operated from a 480V, 60 Hz source.
13.What is polarity when associated with a transformer?
Polarity is the instantaneous voltage obtained from the primary winding in relation to the secondary winding.
14.What is exciting current?
It is the current or amperes required for excitation. The exciting current on most lighting and power transformers varies from approximately 10% on small sizes of about 1 kVA and smaller to approximately 0.5% to 4% on larger sizes of 750 kVA.
Frequently Asked Question
What is Transformer and How does it Works?, Why Do Transformer Hum?, How Can Reduce airborne noise and many more other question.
Free pdf file Transformer Question and Answer
Almost anything that you want to answer with regard specifically.
Power Transformer?
How to Determine Secondary AC (RMS)Current Ratings
For those electrical engineer that want a table for wire ampacity table with rating it is for . This can be useful when you design a transmission lines, electrical wiring of a building etc.. please comments if you want a xls copy I will send you throug email.
PIC Microcontroller Project Book
For PIC Basic and PIC Basic Pro Compliers, the electronics hobbyist market has become more sophisticated. Many users of the PIC are now comfortable shelling out the $250 for the price of the Professional version of the PIC Basic (the regular version sells for $100). This new edition is fully updated and revised to include detailed directions on using both versions of the microcontroller, with no-nonsense recommendations on which is better served in different situations.
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CMOS Electronics
How It Works, How It Fails
The majority of those who work in the CMOS integrated circuit (IC) industry have educational backgrounds other than electrical engineering. The first part of the book assumes little knowledge of circuitry and transistors, covering the relevant basic electronics of CMOS ICs at a tutorial level or as a quick review for electrical engineers.
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Transparent Electronics
From Synthesis to Applications
The first section is devoted to fundamental materials compositions and their properties, including transparent conducting oxides, transparent oxide semiconductors, p-type wide-band-gap semiconductors, and single-wall carbon nanotubes. The second section deals with transparent electronic devices including thin-film transistors, photovoltaic cells, integrated electronic circuits, displays, sensors, solar cells, and electro-optic devices.
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Wire Bonding in Microelectronics, 3 Edition
The definitive resource on the critical process of connecting semiconductors with their packages. Wire Bonding in Microelectronics, Third Edition, has been thoroughly revised to help you meet the challenges of today's small-scale and fine-pitch microelectronics.
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Reference Data for Engineers, Ninth Edition
Radio, Electronics, Computers and Communications
need-to-know topics without heavy emphasis on complicated mathematics, Reference Data for Engineers is an absolute "must-have" for every engineer who requires comprehensive electrical, electronics, and communications data at his or her fingertips. Featured in the Ninth Edition is updated coverage on intellectual property and patents, probability and design, antennas, power electronics, rectifiers, power supplies, and properties of materials.
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Digital Power Electronics and Applications
The authors apply digital control theory to power electronics in a manner thoroughly different from the traditional, analog control scheme. In order to apply digital control theory to power electronics, the authors define a number of new parameters, including the energy factor, pumping energy, stored energy, time constant, and damping time constant.
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Elements of Induction Heating: Design Control and Applications
Here you can see a lot of coil shapes design,tips and data for differents heating situations, circuitry and electronics refered to induction heating, equipment, etc. Very good edition work.
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Sedra Smith Microelectronic Circuits 6th edition
All material in the sixth edition of Microelectronic Circuits is thoroughly updated to reflect changes in technology - CMOS technology in particular. These technological changes have shaped the book's organization and topical coverage, making it the most current resource available for teaching tomorrow's engineers how to analyze and design electronic circuits.
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Semiconductor Cavity Quantum Electrodynamics
The radiative properties of the electron-hole pairs and excitons are modified owing to the drastic change in the structure of the electromagnetic-field modes. This book is the first to give a comprehensive account of the theory of semiconductor cavity quantum electrodynamics for such systems in the weak-coupling and strong-coupling regimes. The important concepts are presented, together with relevant, recent experimental results.
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Essential Retro
The Vintage Technology Guide by James B Grahame
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Logic Synthesis for FSM-Based Control Units
Lecture Notes in Electrical Engineering
Design methods depend strongly on such factors as an FSM model in use, specific features of logic elements implementing its logic circuit, characteristics of a control algorithm to be interpreted. In the case of Moore FSM, optimization methods are based on existence of the classes of pseudoequivalent states.
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The Mechanics of Piezoelectric Structures
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Signal Integrity - Simplified
The electrical properties of the interconnects play a key role in all electronic products operating above 50 MHz clock frequency, such as computers, wireless, rf and telecommunications products. Interconnects can degrade the electrical performance of a system in four ways: ringing, cross talk, noise in the power and ground distribution network and electromagnetic interference (EMI).
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Linear Electronics in Control Systems
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Solid-State Physics for Electronics
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How To Unlock A BlackBerry
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Designing Embedded Systems with the SIGNAL Programming Language
Synchronous, Reactive Specification,he synchronous programming language, SIGNAL, is used to demonstrate the pragmatic design of embedded systems. This is an invaluable tutorial/reference for scientists, practitioners and students.
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Radio Technologies and Concepts for IMT-Advanced
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Fiber Optics
Physics and Technology. This book is a comprehensive source about optical fibers: Their structure, their light-guiding mechanism, their material and manufacture, their use. Several effects tend to degrade the signal as it travels down the fiber.
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Old Time Radios! Restoration and Repair
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Speech Processing in Modern Communication
Challenges and Perspectives. The proposed book deals with the fundamental challenges of speech processing in modern communication, including speech enhancement, interference suppression, acoustic echo cancellation, relative transfer function identification, source localization, dereverberation, andbeamforming in reverberant environments.
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Radiolocation in Ubiquitous Wireless Communication
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Power Electronics
Devices, Drivers, Applications and Passive Components. In this revised and updated version the author has added an entire new section on passive components - capacitors, soft magnetic materials, and resistors. In addition to describing their properties, characteristics, and ratings, he illustrates their use with examples. Important additions to the applications section include converter underlap, reversible converters, and standby and uninterruptible supplies.
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LabVIEW Digital Signal Processing
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Optoelectronic Sensors
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Electrical And Electronics Engineering
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Electronic Materials and Processes Handbook Third Edition
Host of new challenges for those charged with creating materials to meet those devices' specifications. And now, thanks to McGraw-Hill's Electronic Materials Handbook, engineers have comprehensive coverage of the materials that cater to the microminiaturization trend in electronics.
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Power Electronics Semiconductor Devices
Dedicated section presents the capacitors, key passive components in power electronics, followed by a modeling method allowing the stray inductances computation, necessary for the precise simulation of switching waveforms. Thermal behavior associated with power switches follows, and the last part proposes some interesting prospectives associated to Power Electronics integration.
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Electrical and Electronic Principles
(Electrical & Electronic Principles)
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Electric Universe
The Shocking True Story of Electricity
This entertaining look at how electricity works and affects our daily lives is highlighted by Bodanis's charming narrative voice and by clever, fresh analogies that make difficult science accessible. Bodanis examines electricity's theoretical development and how 19th- and 20th-century entrepreneurs harnessed it to transform everyday existence. Going from "Wires" to "Waves" to computers and even the human body, Bodanis pairs electrical innovations with minibiographies of their developers, among them Thomas Edison, Alexander Graham Bell, Guglielmo Marconi, Heinrich Herz and Alan Turing. In each case, Bodanis deepens his narrative by charting early failures?Edison's difficulty in finding a workable filament for the electric light bulb, for example?and financial struggles.
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Handbook of Electronic and Photonic Materials
The handbook provides an accessible treatment of the material by developing the subject matter in easy steps and in a logical flow. Wherever possible, the sections have been logically sequenced to allow a partial coverage at the beginning of the chapter for those who only need a quick overview of the subject.
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Electricity from Sunlight: An Introduction to Photovoltaics
This book is aimed at a wide readership including professionals working in related areas, and students taking introductory courses in PV and renewable energy.
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Electronic Healthcare
The papers focus on topics such as telehealth and mobile health solutions, outbreak management, Web 2.0 and public health communications, EPR - trust, security and decision support, ICT support for patients and healthcare organizations, evaluation of ICT in healthcare.
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Success in Electrical and Electronic Principles II ,2 Ed
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Electrical Engineering: Problems & Solutions
Detailed step-by-step solutions are provided for all problems. Also includes a complete 8-hour practice exam.
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